- Algebraic operations.
- Numerator and denominator have both a limit equal to 0 at the given point.
- Numerator and denominator have both an infinite limit at the given point.
- Difference of two functions whose limit at some point is positive infinite.
- Product of two functions with respectively an infinite limit and a limit equal to 0 at some point.

- Powers.

Noah Dana-Picard 2007-12-28